Telegraph-relay



rNo ModeL atented Decl 19, 1893.

UNITED STATES PATENT ()FFICE.

BANK P. MEDINA, oF SAN FBANoISoo, oALIFoBNIA.

ELEGRAPH-RELAY.

Be ib knOWn that I, BANK P. MEDINA, citi- Zen ()f the Inited StateS, reSiding in the oity and oounty of San Franoiso0, State of (alifornia, have invented oerfain new and uSefuIApparatuS for InoreoSing the }foienoy of Telegrph-1e1ayS and I do hereby deolare the foHoWing fo be a fn11, o1er, nd exaot deSorip tion of Sid inveI1tion, Snoh aS Will enable oth erS Skilled in the rt to Whioh it lnoSt nearly ppoftainS to Inake, uSe, nd prootioe the san1e.

It iS Wel1 known that in the usua1 fornl of telegraph TelalyS the attraotion betWeen the eleofro nagnef and the ar11tnre, iS least When the leve1' is on the baok Stop ajnd gfoateSt Tvhen the lever iS on the front Sfop. fhe objeot of 1]y invention iS to foverSe this and n1ake the atffaofion the groateSt W hen the leve1 ison the baok stop nd leaSf When it iS on the ffonf Stop; alSo fo provide a fnenS foI' haStening the diSoharge of the re1y,S 1ag netiSm at the ond of Signals.

1e1yS in pfoSent 11Se are snbjeot to the faulf that thoir Self indnotion tendS to Tefafd ohangeS of onrrent sffength in their ooilS, ond 111ethodS heretofore in 11Se to prevent thiS Tefafdation are at tho Saorifioo of Inagnetio Strength. I have diSooverod that if the elootro-InognetS aofing on the fe1y arI1ature aro oonStruoted So as to have SIIlallSelfin(1nofion, and are sorrounded by eleotro-Inagnetio Shunf ooilS of re1ative1y gref Self-indnofion, aS explained more fuHy in defail below, there Will be adn added Inagnetio eeot of the beginning of Signal nd a Inore rapid oeSSatioo of fhe magnetisIn of the end. By tho I1So of my invention I aIn further enb1ed to provide againSt or lesSen the effeof of leakage due to defeotivo inSolation.

Fof Inofe oonpfehenSive nndefStanding of n1y invenfion 1'eferenoe I11oSt be had to the ooompanying draWingS in Whioh I igoTe 1 iS top plan vieW ig. 2 Simi]r vieW Showing only one of Single TeSiStnoe and Eig. 3 3 vieW in elevation.

The letterS A, B, afo used fo indiofo the ooilS of a Sfationory o1eotro1ngnef, provided With Shoff ooreS, the magnefio oifouif forfned by the oofeS i11 the nlagnetS B, aand adjoSt able front 11(1 book arn1atofeS being broken byinte )OSitio of airSpaoeS 01' non-n1agnetio SobSfanoeS betWeen tho oofeS and fn1freS, aS o1er1yShovvn in I ig. 1, So aS t0 rendeftheir Self indoofion very SmH, While B, B repro Sent the retafding feSiStanoeS Shunted around the magnef ooilS. TheSe retarding reSisfanoeS Inay have theif Self indnotion adjnSfbIe in Well known ways.

f the beginning of Signal the re1tive1y large ti1eoo11Stant of the ooils B B tufns aJ vefy1rge proporfion of the oorrent along the rontes o B D roducin eorres ondin l 1rge lnagnetio effortS in the ooiIS B. but aS the ourrent in the oirouit approooheS itS Steady valtle, Inofe and lnore of it iS Shonte through the ooils B B So that When the pe riod of sfeody value hS been reaohod, it (livides betWeen the eleofro-IIlognef ooils A B nd the retarding ooilS B B inversoly S their Telative ohn1io TeSiSfnoe. ThnS L v7eakef retraofilo spring oan be nSed With thiS dovioe than iS oroinaril enl lo ed and re1tivel t0 tho fofoe of thiS fetraofile Spring there iS n inoreaSe of fhe 8tfraofing foroe of the e1eot1'0 Inagnet. If Wi1lredi1y bo Seen that thiS loSS of oorfenf in the e1eotroInagnef ooilS iS I10 diSadvantoge, Sinoe af thf tiLTlo the aI'11f turo I iS oloSe to the ooreS, and oan be held by a magnetio sfrength nuoh Weker thn tharf f1ich iS neoeSSary t() drafv it ff()lI1 itS baok Stop. t the end of o Signo1, the extra ourrent f brek due to the so oaHed eleotro nlagnetio inorfio of the refrding ooil oirouif floWS until the il on ooreS are donTagnetized. Thedireotion of thiS onrrent through the ooilS of tho e1eotro11agnet, hoWover iS oppoSito fo thaf of tho ourrent oue to the diS tant bottery, ond thereforo quiokly depo1r izeS fho eleotro n1agnet oofes. ThiS eeof if Will be obServed is due to the diorenoe betWeen the Tetording ooils and tho eleotron1agnef ooilS in solf indnotion. If thiS time oonStant of both oifooifS Wero fhe Sne, the etfav ou1'renf vould diSohrge to tho Inain oifonit.

AS Sh0vn in ig. 2, it iS I10t neoeSSfythat tWo fetafding ooilS be employed, but, aS Set fofth, only one B, need be uSod. Neither iS it nooeSSary that the fetarding ooilS be 10- oated upon the foly baSe, inaSmooh aS the SaIne nJay be looated in any deSired poSition With equally good reSultS,

By diiferentiating the eleotroD1agnetS vvith Ioo rotarding ooils, I rendef them opb1o of be ing uSed on quadruplex and dnplex telegraph SystemS, both With or Without polariZod ool'es of arl]1atures. In qndrop1exto1egrphS the 11Se of thiS relay obviates the WoH known folSe signa1S doe to reversol of a diSfnt Sttion battery.

Iaving thuSdeSofibed nly invention, Wht I olahn aS neW, and deSiro to Seonfe proteotion in by Lettors ]atont of the United StteS iS 1. In a relay With a oirooit oloSing rmatllro aoted upon by the magnef of the Telay, tho oon1bination of the attraoting Inagnef B vvioh the refrding ooilS B B Shunted atonod tho attroting nlagnet as and for the pnrpose set fofth.

2. In relay vvith oirouit c10Sing f[ II a ture aofed upon b the mgnet of tho reloy, tho oonbi 1aJtion of the aftraoting Toagnet B, having Sn11 Solf induotion, With tho retarding ooilS B B h ving re1tive1y1rge selfinduotion, So oS to inoreoSe the attfaotive foroe of tho affraofing Tnagnet of the beginning of Signals and to hSten the revefSal of polarity of said attraoting lnagnet, at the end of Sfg nalS, S and for the purpose Set forth.

30 In a re1ay With oirooit oloSing rmature, aoted opon by the Ilagnet of the 1'e1y, the ooYnbination of the attraoting magnot B, With Tetrding feSiStanoeS B oonneoted aftef tho Inanner of the ar[nS of a vvheatstono bridge, butgiving to the retarding feSistanoes o oo-ecient of self indootion greatof tha that of tho attrocting Inagnef, aS ond for the purpoSo Set forth.

In teStimony Whereof I afIiX my signatore in proSenoe of tWo Witnosses.

EBANK P. MEDINA4 v itneSSeS= A. AOKBB, T D. ORAIG. 

